HDPE is a non-transparent plastic resin that is also widely used in cosmetic packaging of bottles of shampoo, conditioner, lotion and sunscreen. It can be white, coloured or pearlescent by adding pigments and pearl.

Source: Cosmetic Formulation Principles and Practice - Heather A.E. Benson, Michael S. Roberts, Vânia Rodrigues Leite-Silva, Kenneth A. Walters